Abstract
Compared with pipe flow, turbulent structures in unsteady openchannel flows have not been well understood as yet, because experimental equipments to generate unsteady open channel flows were hard to be constructed and because the measurement of turbulence of unsteady flume were also very difficult by conventional hot-film anemometers. Authors succesfully measured turbulent structure in unsteady open-channel flow with a LDA system. In this report, the difference between turbulent structures in unsteady open-channel flows and those in pipe flows is indicated
